JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Liang Cai,Xin Hu,Guangfan Tan,Guangbin Li,Yingchun Zhang
Li 2 TiO 3 is a vital candidate breeder to solve tritium self-consistency of fusion reaction. In this study, Digital Light Processing (DLP) based on Stereolithography technology was used to fabricate Li 2 TiO 3 pebbles for the first time. Ceramic suspensions with different solid loadings were prepared by mixing modified Li 2 TiO 3 powder with UV-curable premixture. The size error of Li 2 TiO 3 green pebbles was corrected by adjusting the deformation factor of equatorial radius, and the Li 2 TiO 3 green pebbles were successfully fabricated with an accurate size. After sintering processing, the Li 2 TiO 3 pebbles with a uniform diameter of 1.5 mm and better sphericity of 1.01 were yielded. The sintering behavior of Li 2 TiO 3 pebbles were investigated. Results showed that the Li 2 TiO 3 pebbles formed with 35 vol% solid loading, and sintered at 1050 ℃ had a uniform pore distribution, and also had optimal properties, such as high relative density of 93.6 %TD, and prominent crush load of 92.3 N.
研究领域:
材料科学
·
核工程
·
增材制造
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Liang Cai,Guangfan Tan,Xin Hu,Zhen Shen,Li Wan,Yingchun Zhang
Li 2 TiO 3 is regarded as a vital tritium breeder candidate due to its favorable properties in Helium-Cooled Pebble Bed. However, the point contact stress breakage for traditional pebble structure can cause the blocking of tritium recovery system, and seriously reduce the safety and tritium self-sufficiency ability of fusion reactor. For addressing above problems, in this paper, complex-shaped Li 2 TiO 3 cubic units were manufactured firstly via lithography-based 3D printing . According to the principle of tritium transport, the cubic unit structures with ordered channels were built and evaluated by finite element analysis . The photocuring parameters were optimized to improve printing accuracy by establishing an overgrowth model. After optimizing the sintering schedule, the Li 2 TiO 3 cubic units with excellent relative density (92.3%TD) and packing factor (80.99%) were yielded, and it also had an outstanding compressive strength (84.4 MPa). The results of thermal cycling test shown that the Li 2 TiO 3 cubic units possessed a prominent thermal cyclic durability.
研究领域:
核工程
·
材料科学
·
增材制造
✓ 已验证
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 10
·1732
·
IF 3.4
Yunfeng Guo,Zexing Wang,Jiamao Li
Nowadays, low-temperature co-fired ceramic (LTCC) technology has become one of the main forms of manufacturing electronic devices. However, a majority of microwave dielectric ceramics are not suitable as LTCC materials due to their high sintering temperatures. Developing novel LTCC materials with good microwave dielectric properties is extremely urgent. In this paper, an LiF sintering aid was added to Li2Ti0.8(Co1/3Nb2/3)0.2O3(LTCN) ceramics to explore new LTCC materials. The sintering behavior, microstructure and microwave dielectric properties of LTCN +xwt% LiF ceramics were investigated in detail. The results indicated that the addition of LiF increased the degree of disorder in the LTCN matrix, transforming it from a monoclinic to a cubic crystal system. The ceramics exhibited relatively dense and homogeneous microstructures at the sintering temperature of 950 °C as the LiF doping amount was not less than 2 wt%. By LiF doping, the quality factor (Q×f) value was significantly enhanced due to the improved microstructure. Meanwhile, the temperature coefficient of resonant frequency (τf) of LTCN ceramics was successfully regulated to the near zero value owing to the negative τfcharacteristic of LiF. Excellent microwave dielectric properties of dielectric constant (εr) = 19.01,Q×f= 144,890 GHz, τf= −1.52 ppm/°C were obtained when the sample doped 3 wt% LiF was sintered at 950 °C for 3 h. Furthermore, the good chemical compatibility of the LTCN-3 wt% LiF ceramic with silver electrodes suggested that the ceramic was a potential material for LTCC applications.Keywords:microwave dielectric properties;LTCC;Li2TiO3-based ceramics;sintering
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2025
·
IF 3.2
Liang Cai,Shurui Shang,Haifeng Xue,Xin Hu,Qiang Qi,Guangna Luo,Yingchun Zhang
Li 2 TiO 3 -Li 4 SiO 4 biphasic ceramic has attracted increasing attention because of its unique advantages for tritium breeding in fusion reaction. To overcome the critical limitations of conventional Li 2 TiO 3 -Li 4 SiO 4 pebbles, particularly their inadequate mechanical strength and low packing density, this work developed high-performance Li 2 TiO 3 -Li 4 SiO 4 cubic units via digital light processing (DLP). The purge gas flow behavior in stacked cubic unit structure was studied by Computational Fluid Dynamics (CFD) method to evaluate its structural characteristics. The photosensitivity and rheological properties of precursor suspension were studied to verify the printing feasibility. Solid loading and sintering process were optimized to yield the defect-free Li 2 TiO 3 -Li 4 SiO 4 cubic unit. The results show that the purge gas had periodic velocity distribution and extremely low pressure drop in the stacked cubic unit structure. Li 2 TiO 3 -Li 2 SiO 3 -Li 2 CO 3 ceramic suspension possessed suitable photosensitivity and thixotropy, and its optimal solid loading was 40 vol%. After sintering at 1100 °C, the Li 2 TiO 3 -Li 4 SiO 4 cubic unit with high relative density (92.8 %TD), high crush load (2000.3 N) and favorable open-pore structure can be prepared. Comparative analyses of Li-based cubic units indicate that the Li 2 TiO 3 -Li 4 SiO 4 cubic unit not only addresses the limitations of single-phase variants but also demonstrates superior intrinsic characteristics, including excellent mechanical& thermomechanical properties and distinct hydrogen isotope release behavior. This work proves the feasibility of Li 2 TiO 3 -Li 4 SiO 4 biphasic strategy and potential of Li 2 TiO 3 -Li 4 SiO 4 cubic units for the future tritium breeding design.
研究领域:
材料科学
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核工程
·
增材制造
·
陶瓷材料
·
聚变能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2019
·
IF 2.547
Ruichong Chen,Mao Yang,Yanli Shi,Hailiang Wang,Hao Guo,Yuanyuan Zeng,Jianqi Qi,Qiwu Shi,Zhijun Liao,Tiecheng Lu
An advanced core-shell ceramic pebble with Li 4 TiO 4 pure phase core and Li 2 TiO 3 nanostructured shell was prepared by a physical coating method. The phase compositions, morphology and microstructure of Li 4 TiO 4 –Li 2 TiO 3 core-shell ceramic pebbles were investigated. We discovered that using chitosan solution to assist rolling coating helps to improve the coating uniformity of core-shell green pebbles. In addition, the results show that the obtained Li 4 TiO 4 –Li 2 TiO 3 core-shell ceramic pebbles have a diameter of ∼1.1 mm, the shell thickness of ∼13 μm and density of 2.31 ± 0.03 g/cm 3 . It is also noted that the Li 2 TiO 3 shell still maintains the nanostructure (∼80 nm) after sintering. This study provides a feasible method for preparing Li 4 TiO 4 –Li 2 TiO 3 core-shell ceramic pebbles which have a great potential application for the test blanket module (TBM) of International Thermonuclear Experimental Reactor (ITER).
研究领域:
材料科学
·
核工程
·
陶瓷
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2018
·
IF 1.1
Hui Mao,Bing Li
Metal titanates have been considered as one of the most promising materials for supercapacitors because of their excellent properties. In this work, porous lithium titanate (Li 2 TiO 3 ) nanomaterials were prepared by sol–gel method using lithiumhydroxide hydrate and tetrabutyl titanate as precursors and polystyrene spheres as a template. The Brunauer-Emmett-Teller (BET) result revealed a large specific surface area of the Li 2 TiO 3 nanomaterials. More importantly, the porous Li 2 TiO 3 nanomaterials were examined as the electrode materials of supercapacitors. Such porous Li 2 TiO 3 nanomaterials’ electrode exhibited a specific capacitance of 195 F g − 1 at a current density of 1 A g − 1 with a capacity retention of 96.3% after 5000 cycles in 3 M KOH aqueous electrolyte. These superior results indicate that the porous Li 2 TiO 3 nanomaterials are excellent materials for high-performance energy storage devices.
研究领域:
材料科学
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储能
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
Nuclear Materials and Energy
·
2023
·
IF 2.6
Xin Chen,Yichao Gong,Kun Kang,Yuefei Wang,Jiarui Li,Zhaokun Li,Tao Wu,Guojun Zhang
Li 2 TiO 3 /Li 4 SiO 4 ceramics have been regarded as promising tritium breeders due to their numerous merits. In this work, chitosan was employed as an effective binder to provide adhesion of Li 2 TiO 3 particles to Li 4 SiO 4 particles, resulting in Li 2 TiO 3 /Li 4 SiO 4 ceramics with improved performance. Chitosan could be removed during the sintering process and had little influence on the phase composition. The resulting Li 2 TiO 3 /Li 4 SiO 4 ceramics had higher density (92.5%T.D.), greater crushing loads (115.2 ± 20.8 N) and superior thermal properties (3.61 W/m∙K) when compared to the samples prepared without chitosan. SEM analyses displayed a dual-scale structure and the inter- and trans -granular fracture mode. Thermal cycling tests revealed that the phase composition was stable but the crushing load fell slightly. The crushing load remained at 92.4 ± 17.1 N after 12 cycles. Overall, chitosan plays an important role in the amelioration of interface combination between Li 4 SiO 4 and Li 2 TiO 3 , and thus significantly improve density, crushing load and thermal conductivity of Li 2 TiO 3 /Li 4 SiO 4 .
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2014
·
IF 2.269
Xuepeng Lu,Yong Zheng,Zuowei Dong,Qi Huang
The novel low-temperature sinterable 0.6Li 2 ZnTi 3 O 8 –0.4Li 2 TiO 3 ceramics were prepared by cofiring the mixtures of pure-phase Li 2 ZnTi 3 O 8 , Li 2 TiO 3 and ZnO–B 2 O 3 –SiO 2 glass. Li 2 ZnTi 3 O 8 and Li 2 TiO 3 phase could well coexist in the sintered samples with no second phase detected. The near-zero temperature coefficients of the resonant frequency ( τ f ) were achieved and simultaneously the desirable quality factor Q × f values could be maintained. Typically, the 0.6Li 2 ZnTi 3 O 8 –0.4Li 2 TiO 3 ceramics with 1.0 wt% ZBS addition could be well densified at only 900 °C and exhibited excellent microwave dielectric properties of ε r =25.4, Q × f =86,400 GHz and τ f =−1.0 ppm/°C, thus showing a great potential as a middle permittivity low-temperature cofired microwave dielectric material .
研究领域:
材料科学
·
电子材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
·
2024
·
IF 2.6
Kang Cheng,Weichao Huang,Xinyong Gong,Chaoyong Deng
The Cr 3 + -activated phosphor can emit far-red light under the excitation of an external light source, mainly due to the transition of the outermost electrons of Cr 3 + from the 2 E level to the 4 A 2 level in a strong crystal field environment. A novel far-red Li 2 TiO 3 : Cr 3 + phosphor was prepared by the solid-state method. Under the excitation of 356 nm, the Li 2 TiO 3 : Cr 3 + phosphors emit intense far-red light in 600–850 nm with a central wavelength of 732 nm. The emission band of all samples was matched with the absorption bands of phytochrome P F R . The experimental data and theoretical calculation confirmed that Cr 3 + is surrounded by a strong crystal field environment. The effect of Cr 3 + doping concentration on the luminescence intensity was analyzed. These research works demonstrate that far-red Li 2 TiO 3 : Cr 3 + phosphors have potential applications in plant growth lights.
研究领域:
材料科学
·
光学材料
·
植物生理学
·
光子学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·Vol. 46
·期 2
·1816-1823
·
IF 3.45
Hao Guo,Hailiang Wang,Ruichong Chen,Yichao Gong,Mao Yang,Yuanyuan Zeng,Zhangyi Huang,Jianqi Qi,Qiwu Shi,Tiecheng Lu
Synthesis of fine Li 2 TiO 3 powders via low-temperature solid-state reaction (LTSSR) was studied. Solid Li 2 CO 3 and H 2 TiO 3 were blended by planetary ball mill with deionized water as medium. Calcination of the milled powder at low temperature of 500 °C resulted in the formation of pure Li 2 TiO 3 nanoparticles . Another Li 2 TiO 3 powder was also prepared by the conventional solid-state reaction (SSR) and a good comparison between different routes was realized. The results show that the particle size of LTSSR powder is significantly decreased to 19.6 nm while the one obtained by SSR is 146.6 nm. Low temperature calcined powders have less agglomeration and higher sinterability , which can be sintered at lower temperature. Pebbles sintered from the LTSSR powders at 750 °C exhibit small grain size (650 nm), high relative density (85.1%) and satisfactory crush load (42.8 N), whereas the SSR pebbles can only be sintered above 950 °C with the relative density close to 80%. Besides, the LTSSR samples also have a higher conductivity at room temperature, indicating the lower tritium diffusion barrier in ceramics. It is confirmed that H 2 TiO 3 rather than TiO 2 is more appropriate for the solid-state reaction to produce Li 2 TiO 3 powders with nano-size particles and favorable properties.
研究领域:
材料科学
·
陶瓷
·
核材料
·
固态化学
·
纳米材料
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·
IF 2.1
Yufei Wang,Yichao Gong,Kun Kang,Zhaokun Li,Jiarui Li,Shuai Ren,Guojun Yan,Guojun Zhang
Numerous efforts have been made to fabricate Li 2 TiO 3 tritium breeding ceramics with satisfactory density and mechanical strength while maintaining a fine grain structure. In this study, high-energy ball milling was performed to promote grain refinement and amorphization of TiO 2 and Li 2 CO 3 powders, thereby preparing Li 2 TiO 3 ceramic at a reduced sintering temperature. In the presence of high-energy ball milling, powder mixtures with particle sizes of 24–29 nm were obtained, and the formation of β-Li 2 TiO 3 occurred at 400°C. The relative density and crushing load of Li 2 TiO 3 ceramic pebbles improved as the ball-to-powder ratio and milling time increased. The Li 2 TiO 3 ceramic pebbles sintered at 900°C exhibited a tiny grain size, satisfactory relative density (89%), and excellent crushing load (121 ± 13 N). The results also demonstrated that Li 2 TiO 3 ceramic possessed the maximum thermal conductivity and ionic conductivity under the conditions of a 20:1 ball-to-powder ratio and 20 h milling time, that is, 5.028 W/m·K and 1.87×10 −2 S/m at room temperature. Overall, the high-energy ball milling process has shown advantages in the fabrication of tritium breeding ceramics with fine-grained structure and excellent comprehensive performance.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Qilai Zhou,Yasuhisa Oya,Takumi Chikada,Wen Zhang,Lihong Xue,Youwei Yan
Ultrafine lithium titanate (Li 2 TiO 3 ) powder was synthesized by hydrothermal method . The phase formation and transition condition among α, β, and γ-Li 2 TiO 3 were discussed. XRD and ICP-AES showed the single α-phase was formed at 180 °C with 2 h hydrothermal reaction, and it transited into β-phase at 400 °C. SEM observation and EDS analysis confirmed the dissolution of TiO 2 and the formation of α-Li 2 TiO 3 proceeded simultaneously with preferable growth direction of (-133) lattice. During the phase transition, the powder maintained the small crystallite , which facilitated the fabrication of Li 2 TiO 3 bulk with small grain size. After the Ar + irradiation, the surface region to the depth of 3 μm of Li 2 TiO 3 ceramic was affected, where the decrease of crystallization and disturbance of short-range order were confirmed by GIXRD and Raman spectroscopy . In spite of the structure change at the surface area, the ceramic bulk maintained the same.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）